Which one of the following exits the spinal cord through the ventral root?
A. Sensory neurons
B. Sympathetic preganglionic neurons
C. Lower motor neurons
D. Both B and C
ANS: D
Rationale: Both sympathetic and parasympathetic preganglionic neurons exit the cord via the ventral root. The ventral horn is primarily cell bodies of lower motor neurons whose axons exit the spinal cord via the ventral root.
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